mitt romney has to avoid appearing detached. his to-do list, the three cs, show compassion, that he's competent and that he can indeed connect the voters. >> on those three cs, that's where he's got to really do well. >> reporter: while they lead in the polls, team obama know that debates can be a game-changer. so the president will have to look strong and forceful, not passive. he needs to avoid appearing irritable or impatient. and don't be long-winded. >> they need him to answer questions short, concise. and to the point. it's more his mannerismsened his style and the way he comes across. >> the pressure is on for this first debate. it could be a huge audience. anywhere between 50 million to 65 million people may tune in to see these two men square off on wednesday night. >> david, thank you. >> great to see you live, david. >>> let's bring in "this week" host george stephanopoulos. also live, for more on this. the goal wednesday night is for each candidate to focus on the other person's weakness. >> exactly. after seeing ron